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Finding the Fourth Proportional to 913.15, 1,369.69 and 255.02

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Solution

The fourth proportional to 913.15, 1,369.69 and 255.02 is: 382.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.15 : 1,369.69 = 255.02 : x
  2. Step 2: Convert to fraction form
    913.15/1,369.69 = 255.02/x
  3. Step 3: Cross multiply
    913.15x = 1,369.69 × 255.02
  4. Step 4: Simplify right side
    913.15x = 349,298.34
  5. Step 5: Solve for x
    x = 349,298.34/913.15
  6. Step 6: Final answer
    x = 382.52

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.